Research on AC Permanent Magnet Synchronous Motor Servo System

　　Research on AC Permanent Magnet Synchronous Motor Servo System
　　With the development of material technology,power electronics technology, control theory,computer technology,miero-electronics technology and the improvement of motor manufacture level,alternating current(AC) permanent magnet synchronous motor(PMSM) servo control system is widely used in all kinds of industry areas.For its exeellent performance and various configurations,PMSM is used in many fields,such as agriculture,human’s live,aviation,spaceflight and national defense.We drive and control PMSM with frequeney conversion electrical source to gain more excellent performance and more accurate precision.So the research of timing control system of PMSM is very important.This thesis,based on analyzing the strueture and mathematies model of PMSM,empolders the digital servo
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 system of vector control of PMSM through using the TMS320F2812 of TI Company as its core.This thesis from the background and significance of topic,introduces the general development situation of AC servo system of PMSM.Then not only the mathematic model,operation principle of PMSM and the basic theory of vector control for PMSM are all illuminated,but also the theory and algorithm of voltage space vector pulse width modulation is analyzed.
　　On the basis of the principle of vector control,four current control methods of PMSM vector control are discussed in detail.It suggests that the rotor field-orientation vector control of i_d=0 can be chosen,in view of the surface mounted PMSM used in the item.Based on automation theory,the configuration and mathematical model of all parts of PMSM servo system are analyzed carefully.The three loops of the system are designed with the help of engineering design method of automation system regulator.The simulation of the system is taken,and the stability of the system is studied.Then the system hardware and software design are narratived.The Microprocessor and peripheral circuit,the main loop circuit,power module, detectiing circuit and system protection circuit of servo system are introduced in hardware design;in software design,this thesis introduces the design of the control program,main control program and timer1 underflow interrupt program structure. More it introduces some sub-program,like the rotor position and speed adjusting, the current sampling and adjusting,SVPWM program e.g.Finally,some experiments are done on the experimental platform of the whole system.The final result shows that this system can satisfy basic requirements of the servo system performance. 更多还原

Optimization Design and Digital Control Research on Bearingless Permanent Magnet-Type Motor

　　Optimization Design and Digital Control Research on Bearingless Permanent Magnet-Type Motor
　　A Bearingless Motor is a novel electro-magnetic machine that has the functions of the electric motor and an active magnetic bearing.Bearing windings are wound together with conventional torque windings to produce radial suspension forces in stator slot of the bearingless motors.The rotor is successfully supported by electromagnetic forces and rotates as the conventional motors.Compared to traditional permanent magnet motor,permanent magnet type bearingless motor has a serial of more advantages,such as no mechanical touch,no wear, high-speed,high-precision and long http://www.999magnet.com/products/108-alnico-magnets life-span.So it has potential prospect application in those special electric transmission fields of bioengineering,aviation,new energy sources, semiconductor manufacture and medicine sanitation and so on.Thus the research on permanent magnet-type bearingless motor has attached special attentions.The main works of this dissertation are as follows:Firstly,the basic configuration and function principle of permanent magnet-type bearingless motor are discussed in detail and the mathematics model of motor is deduced.Then,the theory of rotor flux orientation control is adopt to realize the independent control of circumrotate and suspend stably to the rotor as well as decoupling control between torque force and radial suspension force.Also,the decoupling control diagram of the permanent magnet-type bearingless motor is given out.Secondly,the model’s design of the permanent magnet-type bearingless motor is studied. And the designs to the structure of permanent magnet-type rotor,torque winding and suspension winding are analyzed in detail.
　　At the same time,the influences to torque performance and suspension performance because of the permanent magnet thickness are lucubrated.Based on this, the number of turns of torque winding and suspension winding,optimal suspension force,optimal output power are optimized by using ANSYS software.Furthermore,the basic work theory of the permanent magnet-type bearingless motor is testified.It educes that radial force which can suspend rotor is produced surely when torque winding and suspension winding electrified at one time.Finally,based on rotor flux orientation control of permanent magnet type bearingless motor and its mathematics model,the structure of digital control system is designed and simpled for permanent magnet type bearingless motor.Then,the hardware and software of digital control system is designed based upon TMS320LF2407 of TI Corporation.The digital control system is debugged and optimized.The experimental results of digital control system are given and the results of debugging validate that the control strategy and control system satisfies the needs of control.

Direct Torque Control of Permanent Magnet Synchronous Motor for Hybird Electric Vehicles

　　Direct Torque Control of Permanent Magnet Synchronous Motor for Hybird Electric Vehicles
　　The dissertation is presented to the study on permanent magnet synchronous motor (PMSM) drive system for the tandem hybrid electric vehicles (HEV) application. Direct Torque Control (DTC) method is quoted from drive characteristic on electric motor control witch through theoretical analysis, computer simulation or experimental validation. The Maximum Torque Per Ampere (MTPA) control has be introduced for optimizing the traditional DTC method which http://www.chinamagnets.biz could ameliorate the control performance. For more speed governing scope, field-weakening control has been carried out above the basic speed. Enhancing the field-weakening capability could upgrade high speed performance for HEV running. The main contributions of dissertation as follows:Firstly, the MTPA control strategy in constant torque area strategy in constant power area is analyzed through structuring the PMSM mathematical mould, which the DTC method on PMSM has been studied further deeply. The influence of different parameters on the PMSM output power, torque and extend speed capacity witch has be analyzed. The field weakening control strategy in constant power area is analyzed through structuring the PMSM mathematical mould. The modified parameters switching method has be applied in the constant torque area and the constant power for simulation. The more effective DTC method witch combines MTPA has be compared with traditional DTC could reduce more ripples of the DTC in the low speed region.
　　The simulation analysis could pave for the further experiment research with foundation.Secondly, the PMSM DTC control system test-bed has be build including both the software and hardware of the Based on TI company DSP designed for motor control on TMS320f2812 micro-chip for a full-digital PMSM control system. The hardware drive design for DSP interface circuit and the power control circuit combine with C computer language program for DTC been studied further deeply in DSP.Finally, the experiment has been done for the research. Results of the experiment and simulation indicate validity of the reducing speed and torque ripples from traditional DTC in low frequency running and the field-weakening method for HEV which introduced in the paper. 更多还原